Journals / Journal of Istanbul Veterinary Sciences / 2026 / Cilt: 10 Sayı: 2

Investigation of Antimicrobial and Antioxidant Activity of Hypericum retusum Aucher Plant

Hypericum retusum Aucher Bitkisinin Antimikrobiyal ve Antioksidan Aktivitesinin İncelenmesi.

Kemal Metiner(ISTANBUL UNIVERSITY-CERRAHPASA, FACULTY OF VETERINARY MEDICINE)0000-0003-4105-5852
Ceren Anlaş(ISTANBUL UNIVERSITY-CERRAHPASA, FACULTY OF VETERINARY MEDICINE)0000-0002-7997-016X
Simten Yeşilmen Alp(DICLE UNIVERSITY, FACULTY OF VETERINARY)0000-0002-2952-5180
Belgi Diren Siğirci(ISTANBUL UNIVERSITY-CERRAHPASA, FACULTY OF VETERINARY MEDICINE)0000-0001-7153-7428
Pages
157–164
Publication Date
2026-08-31
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

The findings revealed that the methanol extract exhibited pronounced antimicrobial effectiveness, particularly against Gram-positive bacteria (including S. aureus, S. epidermidis, and B. cereus), achieving a minimum inhibitory concentration (MIC) of 6.51 µg/ml.

📌 3 Key Takeaways

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Objective & Hypothesis:Hypericum species have attracted considerable scientific interest due to their diverse phytochemical composition and pharmacological properties.
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Key Findings & Data:Our methodology included utilizing agar dilution and broth macrodilution techniques to test antimicrobial and antifungal efficacy, while the 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging assay was employed to determine antioxidant activity.
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Conclusion & Impact:The findings revealed that the methanol extract exhibited pronounced antimicrobial effectiveness, particularly against Gram-positive bacteria (including S. aureus, S. epidermidis, and B. cereus), achieving a minimum inhibitory concentration (MIC) of 6.51 µg/ml.
🔬Design:Araştırma Makalesi
📍Scope:Comprehensive Sample
⚙️Variables:Hypericum retusum Aucher · antimicrobial · antimycotic

Abstract

Hypericum species have attracted considerable scientific interest due to their diverse phytochemical composition and pharmacological properties. Researchers worldwide are actively investigating the antimicrobial, antiviral, anti-inflammatory, antidiabetic, and antioxidant properties inherent in these botanicals. Given the escalating challenge of antibiotic resistance, identifying novel, plant-based antimicrobial solutions is now more crucial than ever. This research sought to assess the antimicrobial and antioxidant capabilities of both methanol and aqueous extracts derived specifically from the leaves of the Hypericum retusum Aucher plant. Our methodology included utilizing agar dilution and broth macrodilution techniques to test antimicrobial and antifungal efficacy, while the 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging assay was employed to determine antioxidant activity. Total phenolic content was quantified using the Folin-Ciocalteu assay. The findings revealed that the methanol extract exhibited pronounced antimicrobial effectiveness, particularly against Gram-positive bacteria (including S. aureus, S. epidermidis, and B. cereus), achieving a minimum inhibitory concentration (MIC) of 6.51 µg/ml. B. subtilis was inhibited at 13.02 µg/ml. Notably, no activity was detected against any of the Gram-negative bacterial strains tested. In the antioxidant assessment, both methanol and aqueous extracts showed similar radical scavenging activities, with IC50 values determined as 46.18 ± 0.33 µg/mL and 40.86 ± 0.68 µg/mL, respectively. The total phenolic content was remarkably higher in the aqueous extract (424.41 ± 1.48 mg GAE/g dry extract). These findings suggest that H. retusum Aucher may be a potential source of bioactive compounds with antimicrobial activity against Gram-positive bacteria and antioxidant properties.

Özet

Hypericum türleri, çeşitli fitokimyasal bileşimleri ve farmakolojik özellikleri nedeniyle önemli bilimsel ilgi çekmiştir. Dünya çapındaki araştırmacılar, bu bitkilerde bulunan antimikrobiyal, antiviral, antiinflamatuar, antidiyabetik ve antioksidan özellikleri aktif olarak araştırmaktadır. Antibiyotik direncinin giderek artan zorluğu göz önüne alındığında, yeni, bitki bazlı antimikrobiyal çözümlerin belirlenmesi her zamankinden daha önemlidir. Bu araştırma, özellikle Hypericum retusum Aucher bitkisinin yapraklarından elde edilen hem metanol hem de sulu ekstraktların antimikrobiyal ve antioksidan yeteneklerini değerlendirmeyi amaçlamıştır. Metodolojimiz, antimikrobiyal ve antifungal etkinliği test etmek için agar dilüsyon ve sıvı makrodilüsyon tekniklerini kullanmayı içerirken, antioksidan aktiviteyi belirlemek için 2,2-difenil-1-pikrilhidrazil (DPPH) radikal süpürme testi kullanılmıştır. Toplam fenolik içerik, Folin-Ciocalteu testi kullanılarak ölçülmüştür. Bulgular, metanol ekstraktının özellikle Gram-pozitif bakterilere (S. aureus, S. epidermidis ve B. cereus dahil) karşı belirgin antimikrobiyal etkinlik gösterdiğini ve 6,51 µg/ml'lik minimum inhibitör konsantrasyonuna (MIC) ulaştığını ortaya koymuştur. B. subtilis 13,02 µg/ml'de inhibe edilmiştir. Dikkat çekici bir şekilde, test edilen Gram-negatif bakteri suşlarının hiçbirine karşı herhangi bir aktivite tespit edilmemiştir. Antioksidan değerlendirmesinde, hem metanol hem de sulu ekstraktlar benzer radikal temizleme aktiviteleri göstermiş olup, IC50 değerleri sırasıyla 46,18 ± 0,33 µg/mL ve 40,86 ± 0,68 µg/mL olarak belirlenmiştir. Toplam fenolik içeriği sulu ekstraktta belirgin şekilde daha yüksekti (424,41 ± 1,48 mg GAE/g kuru ekstrakt). Bu bulgular, H. retusum Aucher'in Gram-pozitif bakterilere karşı antimikrobiyal aktiviteye ve antioksidan özelliklere sahip biyoaktif bileşiklerin potansiyel bir kaynağı olabileceğini göstermektedir.

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Cite This Article

Metiner, K., Anlaş, C., Alp, S. Y., Siğirci, B. D., *, K. M. (2026). Investigation of Antimicrobial and Antioxidant Activity of Hypericum retusum Aucher Plant. Journal of Istanbul Veterinary Sciences, Cilt: 10 Sayı: 2, 157–164. https://doi.org/10.30704/http-www-jivs-net.1935855

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